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/*
* Copyright 2009 Phil Burk, Mobileer Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.jsyn.unitgen;
import com.jsyn.data.FloatSample;
import com.jsyn.data.SegmentedEnvelope;
import com.jsyn.data.ShortSample;
import com.jsyn.ports.UnitOutputPort;
/**
* This reader can play any SequentialData and will interpolate between adjacent values. It can play
* both {@link SegmentedEnvelope envelopes} and {@link FloatSample samples}. <code><pre>
// Queue an envelope to the dataQueue port.
ampEnv.dataQueue.queue( ampEnvelope );
</pre></code>
*
* @author Phil Burk (C) 2009 Mobileer Inc
* @see FloatSample
* @see ShortSample
* @see SegmentedEnvelope
*/
public class VariableRateMonoReader extends VariableRateDataReader {
private double phase; // ranges from 0.0 to 1.0
private double baseIncrement;
private double source;
private double current;
private double target;
private boolean starved;
private boolean ranout;
public VariableRateMonoReader() {
super();
addPort(output = new UnitOutputPort("Output"));
starved = true;
baseIncrement = 1.0;
}
@Override
public void generate(int start, int limit) {
double[] amplitudes = amplitude.getValues();
double[] rates = rate.getValues();
double[] outputs = output.getValues();
for (int i = start; i < limit; i++) {
// Decrement phase and advance through queued data until phase back
// in range.
if (phase >= 1.0) {
while (phase >= 1.0) {
source = target;
phase -= 1.0;
baseIncrement = advanceToNextFrame();
}
} else if ((i == 0) && (starved || !dataQueue.isTargetValid())) {
// A starved condition can only be cured at the beginning of a
// block.
source = target = current;
phase = 0.0;
baseIncrement = advanceToNextFrame();
}
// Interpolate along line segment.
current = ((target - source) * phase) + source;
outputs[i] = current * amplitudes[i];
double phaseIncrement = baseIncrement * rates[i];
phase += limitPhaseIncrement(phaseIncrement);
}
if (ranout) {
ranout = false;
if (dataQueue.testAndClearAutoStop()) {
autoStop();
}
}
}
public double limitPhaseIncrement(double phaseIncrement) {
return phaseIncrement;
}
private double advanceToNextFrame() {
// Fire callbacks before getting next value because we already got the
// target value previously.
dataQueue.firePendingCallbacks();
if (dataQueue.hasMore()) {
starved = false;
target = dataQueue.readNextMonoDouble(getFramePeriod());
// calculate phase increment;
return getFramePeriod() * dataQueue.getNormalizedRate();
} else {
starved = true;
ranout = true;
phase = 0.0;
return 0.0;
}
}
}
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